Allow node < 4.5.0

lib/api/keccak.js

@@ -44,7 +44,7 @@ module.exports = function (KeccakState) {
   Keccak.prototype.update = function (data, encoding) {
     if (!Buffer.isBuffer(data) && typeof data !== 'string') throw new TypeError('Data must be a string or a buffer')
     if (this._finalized) throw new Error('Digest already called')
-    if (!Buffer.isBuffer(data)) data = Buffer.from(data, encoding)
+    if (!Buffer.isBuffer(data)) data = new Buffer(data, encoding)
 
     this._state.absorb(data)
 

lib/api/shake.js

@@ -38,7 +38,7 @@ module.exports = function (KeccakState) {
   Shake.prototype.update = function (data, encoding) {
     if (!Buffer.isBuffer(data) && typeof data !== 'string') throw new TypeError('Data must be a string or a buffer')
     if (this._finalized) throw new Error('Squeeze already called')
-    if (!Buffer.isBuffer(data)) data = Buffer.from(data, encoding)
+    if (!Buffer.isBuffer(data)) data = new Buffer(data, encoding)
 
     this._state.absorb(data)
 

lib/keccak.js

@@ -46,7 +46,7 @@ Keccak.prototype.absorbLastFewBits = function (bits) {
 Keccak.prototype.squeeze = function (length) {
   if (!this.squeezing) this.absorbLastFewBits(0x01)
 
-  var output = Buffer.allocUnsafe(length)
+  var output = new Buffer(length)
   for (var i = 0; i < length; ++i) {
     output[i] = (this.state[~~(this.count / 4)] >>> (8 * (this.count % 4))) & 0xff
     this.count += 1

package.json

@@ -55,7 +55,7 @@
     "tape": "^4.5.1"
   },
   "engines": {
-    "node": ">=4.5.0"
+    "node": ">=4.0.0"
   },
   "gypfile": true,
   "browser": {

test/api-sha3.js

@@ -23,7 +23,7 @@ module.exports = (name, createHash) => {
 
       t.plan(1)
       hash.update = () => { throw err }
-      hash._transform(Buffer.allocUnsafe(0), 'buffer', (_err) => t.true(_err === err))
+      hash._transform(new Buffer(0), 'buffer', (_err) => t.true(_err === err))
       t.end()
     })
 
@@ -33,7 +33,7 @@ module.exports = (name, createHash) => {
   test(`${name} Keccak#_flush`, (t) => {
     t.test('should use Keccak#digest', (t) => {
       const hash = createHash('sha3-256')
-      const buffer = Buffer.allocUnsafe(0)
+      const buffer = new Buffer(0)
 
       t.plan(2)
       hash.push = (data) => t.true(data === buffer)
@@ -78,7 +78,7 @@ module.exports = (name, createHash) => {
     t.test('should return `this`', (t) => {
       const hash = createHash('sha3-256')
 
-      t.same(hash.update(Buffer.allocUnsafe(0)), hash)
+      t.same(hash.update(new Buffer(0)), hash)
       t.end()
     })
 

test/api-shake.js

@@ -24,7 +24,7 @@ module.exports = (name, createHash) => {
 
       t.plan(1)
       hash.update = () => { throw err }
-      hash._transform(Buffer.allocUnsafe(0), 'buffer', (_err) => t.true(_err === err))
+      hash._transform(new Buffer(0), 'buffer', (_err) => t.true(_err === err))
       t.end()
     })
 
@@ -42,7 +42,7 @@ module.exports = (name, createHash) => {
         }
       })
 
-      let data = Buffer.allocUnsafe(0)
+      let data = new Buffer(0)
       const squeezed = '46b9dd2b0ba88d13233b3feb743eeb243fcd52ea62b81b82b50c27646ed5762f'
       const dst = stream.Writable({
         write (chunk, encoding, callback) {
@@ -84,7 +84,7 @@ module.exports = (name, createHash) => {
     t.test('should return `this`', (t) => {
       const hash = createHash('shake256')
 
-      t.same(hash.update(Buffer.allocUnsafe(0)), hash)
+      t.same(hash.update(new Buffer(0)), hash)
       t.end()
     })
 
@@ -128,7 +128,7 @@ module.exports = (name, createHash) => {
 
       const squeezed1 = hash1.squeeze(32, 'hex')
       t.throws(() => {
-        hash1.update(Buffer.allocUnsafe(0))
+        hash1.update(new Buffer(0))
       }, /^Error: Squeeze already called$/)
       t.equal(hash2.squeeze(32, 'hex'), squeezed1)
 

test/js-keccak.js

@@ -18,7 +18,7 @@ function to32bin (x) {
 test('absorb', (t) => {
   const keccak = new Keccak()
   keccak.initialize(56, 1544)
-  keccak.absorb(Buffer.allocUnsafe(10).fill(0x01))
+  keccak.absorb(new Buffer(10).fill(0x01))
 
   t.equal(keccak.state[0], (0x01 << 24))
   t.equal(keccak.state[1], (0x01 << 16) | (0x01 << 8) | (0x01 << 0))
@@ -48,7 +48,7 @@ test('absorbLastFewBits', (t) => {
 test('squeeze', (t) => {
   const keccak = new Keccak()
   keccak.initialize(56, 1544)
-  keccak.absorb(Buffer.allocUnsafe(5).fill(0x01))
+  keccak.absorb(new Buffer(5).fill(0x01))
 
   t.equal(keccak.squeeze(7).toString('hex'), '01010101010180')
   t.equal(keccak.squeeze(3).toString('hex'), '010101')

test/vectors-keccak.js

@@ -12,7 +12,7 @@ const vectors = [{
 module.exports = (name, createHash) => {
   for (let i = 0; i < vectors.length; ++i) {
     const vector = vectors[i]
-    const data = Buffer.from(vector.input, 'hex')
+    const data = new Buffer(vector.input, 'hex')
 
     for (let hash of ['keccak224', 'keccak256', 'keccak384', 'keccak512']) {
       test(`${name} ${hash} vector#${i}`, (t) => {